Key;
Laboratory;
of;
Biogeology;
and;
Environmental;
Geology,;
Wuhan;
430074,;
China;
Survey;
of;
Gansu;
Province,;
Lanzhou;
730000,;
China;
University;
of;
Technology,;
School;
of;
Resources;
and;
Environmental;
Engineering,;
Hefei;
230009,;
China;